[mulcyber]

French salaries are much lower.

On the up side, a lot of things are much cheaper or free (medical fees, internet, life in general except maybe the housing, depending where in the US and in France).

But yes, for your income bracket, you're likely to be worst off.

Keep looking, because salaries in tech are wildly variable, literally 25k to 100k+.

Keep in mind, high salaries are likely to be in Paris, but life their is expensive, especially housing.

And finally, it's your choice. Money is not everything in life, and since you'll be confortable either way, you can choose to gain less for an experience you want to live. Only you can answer if it's worth it or not ;)